HI:
That’s not normal / with a 400cu. and a 2.56 Rear Gear you should be able to light’em – up! Assuming your engine runs fine: good compression, no vacuum leeks etc.
Did you consider checking your Transmission?
a.Check the Transmission fluid {ATF} for proper level and color, the normal color of automatic transmission fluid is a deep red or orange red; and it
shouldn’t be
Black, Brown, Green/Brown or Pinkb.It
shouldn’t have a burned odor to it. (If the color of the ATF is Black or Brown shaded and has a burned odor to it their is a good possibly the Transmission is damaged and servicing of the ATF fluid; and filter at this point may not help
c.Check the Trans./ Modulator to see if defective, an Modulator Vacuum Hose for it’s condition and for proper installation // (check for cracks or broken)
Examining the {ATF} fluid color as follows:
Remove the Trans./ Dipstick wipe the fluid onto a white paper this will allow you to see the true color of the ATF fluid as it adsorbed into the paper.
a.If the ATF fluid is Pink shade and/or milky feel to it; the Transmission fluid cooler in the Radiator is leaking coolant into the Transmission oil cooler lines and it will damage the Transmission (The Ethylene Glycol in the antifreeze breaks down the bonding material in the bands and / or clutch discs.)
b.If the ATF fluid is Red but is foamy – bubbles the fluid level is to high.
c.If the ATF fluid is Green / Water Contamination which can damage the Transmission.
d.If the ATF fluid has large amounts of
particles that are found / The Transmission bands, clutches and / or friction material, could be worn or damaged
Also Conduct a Road Test:
While driving try to note any unusual operations in the Transmission such as:
a.Vibrations
b.Unusual Noise
c.Poor Shifting Quality
d.Slippage
e.Erratic Shift Pattern's
f.Note if you can how many Gears being Shifted 1. into 2. ect. In the Transmission
And finally check the Rear End:
With Jack Stands and the rear wheels off the ground check it’s operation etc.
Hope This Can Be Of Some Help To You.
Justin K.